240 A Monograph of the Myxogastres. 



to form a dense net, with the angles usually triangular ; spores 

 dingy purple, globose, warted, 12 14 p. diameter. 



(Type in Herb. Berk., Kew., with Tilmadoche nutans.) 



On bark. Ceylon. 



Scattered, 1*5 2 mm. high. Bearing a superficial resem- 

 blance to Tilmadoche nutans, but distinct in the capillitium, 

 which contains no trace of lime, and in the spores. 



Didymium zeylanicum, B. and Br. TvicWw|VKii 



Sporangium hemispherico-depressed, with a shallow umbilicus 

 below, wall thin, colourless, frosted with white granules of lime ; 

 stem elongated, attenuated upwards, or almost obsolete, brown 

 or yellow, longitudinally wrinkled, filled with small grains of 

 lime, expanding below into a spreading hypothallus ; capillitium 

 forming a dense irregular net, threads colourless, very thin; 

 spores dark purple, globose, very minutely verruculose, 7 9 /* 

 diameter. 



Didjymium zeylanicum, B. and Br., in Journ. Linn. Soc., vol. 

 xiv., p. 84. 



Chondrioderma zeylanicum, Host., Mon. App., p. 15 ; Sacc., 

 Syll., no. 1254. 



Ctwndrioderma exiguum, Racib., Hedw., 1889, p. 118. 

 (Type in Herb. Berk., no. 10770.) 



On decayed wood. Ceylon ; Poland. 



The species described as Chondrioderma exiguum cannot be 

 separated from the present species; the points of difference 

 given by Raciborski only apply to certain individuals which, 

 from an examination of the type, is a variable species. 



Didymium obrusseum, B. and C. v*t o\>-< 



Sporangium white or pale yellow, almost globose, sometimes 

 slightly umbilicate below, wall very thin, with little or no lime, 

 often iridescent when empty ; stem attenuated upwards, flattened 

 and distorted below, weak and drooping, bright yellow, expanding 

 at the base into a very thin, irregular hypothallus of the same 

 colour; columella absent; capillitium rather scanty, threads 



